A. latezonatus did not fit within this clade and has a monospecific lineage. The yellow tail of A. sebae distinguishes that species from A. polymnus. Distribution and habitat A. polymnus is found in the center of the Indo-Pacific area, known as the Coral Triangle, from the Philippines to Indonesia and New Guinea.It is also found in northern Australia, Melanesia and to the Ryukyu Islands of southern Japan. Adults inhabit silty lagoons and harbour areas in depth range from . Host anemones The relationship between anemonefish and their host sea anemones is not random and instead is highly nested in structure. A. polymnus is a specialist, being hosted by 2 out of the 10 host anemones: Heteractis crispa Sebae anemone (rarely) Stichodactyla haddoni (Saddle carpet anemone) Diet Like all anemonefish, A. polymnus is omnivorous and its diet is based on zooplankton, small benthic crustaceans and algae. Behaviour A. polymnus has a diurnal activity, is aggressively territorial and is dependent on its host sea anemone which it uses as a shelter for the group and for the nest. The anemonefish can also defend the anemone against some reef fishes which could eat the tentacles such as butterflyfishes. Both species of sea anemone, which host A. polymnus, are known to bury themselves in the sand when they are under stress, leaving the fish vulnerable to predation. It has been suggested that the almost equal size of the male is an adaptation to allow it to elude predators by erratic swimming in the water column or covering the relatively long distance to shelter in coral rubble. Conservation status Anemonefish and their host anemones are found on coral reefs and face similar environmental issues. Like corals, anemones contain intracellular endosymbionts, zooxanthellae, and can suffer from bleaching due to triggers such as increased water temperature or acidification. The other threat to anemonefish is collection for the marine aquarium trade where anemonefish make up 43% of the global marine ornamental trade, and 25% of the global trade comes from fish bred in captivity, while the majority are captured from the wild, accounting for decreased densities in exploited areas. While bleaching is a significant threat to anemonefish and their host anemones, there is evidence suggesting that collection compounds the localised impact of bleaching. This species was not evaluated in the 2012 release of the IUCN Red List. In the aquarium A. polymnus has been bred in captivity. The